The nickel price tends to be volatile, for several reasons: one is that nickel mines are highly localised in nature. Most high-nickel ore areas are suspected of originating either from ancient asteroid impacts or from ancient upwellings of deep-mantle lava dragging nickel up from the planet's core. Both possible origins are highly localized in nature. So when the nickel mine is operating, there's lots of nickel to be found, but when it runs out, it can stop, rather suddenly. They found this out in Greenvale, Australia: a rich and active nickel mine from 1973, but the nickel abruptly ran out in 1993.
All this means that nickel mining is riskier than many other minerals, as the investment put into mining and refining operations can become worthless with very little warning. The Queensland Nickel refinery, built on the coast at Townsville specifically to refine the Greenvale ore, continued operating for two more decades mainly using nickel ore imported by ship from New Caledonia. But this refinery just recently (and somewhat controversially) went broke and shut down.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis